This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Numerical Study on Skin Temperature and Heat Loss of Vehicle Exhaust System
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 11, 2005 by SAE International in United States
Annotation ability available
The ability to accurately predict skin temperatures of catalytic converter and manifold is very important for a robust/durable design of the vehicle exhaust system, especially in the development of close coupled converter system. In this paper, Computational Fluid Dynamics (CFD) is used to calculate the skin temperature of complicated components in vehicle exhaust system such as catalytic converter. Generally, a catalytic converter consists of substrate, mat, outer shell, inner cone, cone insulation, and outer cone. 3-D compressible turbulent fluid flow with heat transfer involved in force and natural convections, heat conduction and radiation is numerically simulated. First, both numerical calculation and experimental tests are conducted for a catalytic converter under the same operation conditions to evaluate the accuracy of current numerical method. Good agreement is found between CFD prediction and experimental tests. Next, the method developed is employed to investigate the effect of different mat materials and thickness, different cell structures of substrate and different kinds of cone insulations on skin temperature. Furthermore, the heat loss of exhaust gas through the dual pipe duct is studied. The effect of air gap between inner and outer tubes and inlet gas temperature on heat loss is investigated and the optimization of the air gap is obtained to minimize the total heat loss. A general correlation of temperature loss through the dual pipe is given at end as a function of tube air gap and inlet exhaust gas temperature. The analytical simulations have highlighted the benefits of using numerical tools in optimizing the exhaust system design.
CitationZhang, X., Meda, L., and Keck, M., "Numerical Study on Skin Temperature and Heat Loss of Vehicle Exhaust System," SAE Technical Paper 2005-01-1622, 2005, https://doi.org/10.4271/2005-01-1622.
- Chung Cathy Rajadurai Sivanandi Geer Larry J. CFD Investigation of Thermal Fluid Flow and Conversion Characteristics of the Catalytic Converter SAE Paper 1999-01-0462 1999
- Spreen Kent B. Fox Douglas J. Heimrich Martin J. Beason Richard E. Catalytic Converter Thermal Environment Measurement Under Dynamometer-Simulated Road Loads SAE Paper 2000-01-0216 2000
- Rajadurai Sivanandi Geer Larry J. Chung Cathy Cheng H. Michels Jack Carlson T. Shoebox Converter Design for Thinwall Ceramic Substrates SAE Paper 1999-01-1542 1999
- Locker Robert J. Sawyer Constance B. Low-Temperature Catalytic Converter Durability SAE Paper 2000-01-0220 2000
- Katari Ashutosh Berkman Mert Eikenbary Rick Bhandari Girish Shulze Karl Thermal Shock Study of a Converter Package for a Drive Cycle SAE Paper 2003-01-3073 2003
- Chung Cathy Geer Larry Rajadurai Sivanandi Numerical Simulation and Experimental Validation of the Catalytic Converter Cool Down Process SAE Paper 2000-01-0204 2000
- Li Fong Z. Analytical Solution for Heat Flow in Cylinder and Its Application in Calculating Converter Skin Temperature SAE Paper 2000-01-0301 2000
- Zidat Said Parmentier Michael Heat Insulation Methods for Manifold Mounted Converters SAE Paper 2000-01-0215 2000
- Launder B. E. Spalding D. C. Lectures in Mathematical Models of Turbulence Academic Press London, England 1972
- Launder B. E. Spalding D. C. The Numerical Computation of Turbulent Flows Computer Methods in Applied Mechanics and Engineering 3 269 389 1974
- Vandoormaal J. P. Raithby G. D. Enhancements of the SIMPLE method for Predicting Incompressible flow Numerical Heat Transfer 7 147 163 1964
- Mahan J. Robert Radiation Heat Transfer: A Statistical Approach Wiley Europe June 2002
- Rohsenow Warren M. Hartnett James P. Handbook of heat Transfer McGraw-Hill 1998